Aperture driving mechanism, lens driving device and camera module

Abstract

The utility model relates to an aperture driving mechanism, a lens driving device and a camera module, comprising an aperture support and a plurality of aperture blades moving relative to the aperture support in a plane vertical to an optical axis, an aperture driving frame for driving the aperture blade to move so as to change the aperture of the light inlet hole is arranged on the aperture bracket, one of a driving magnet or a driving coil is arranged on the aperture driving frame, and the driving magnet and the driving coil are oppositely distributed at intervals along the direction of the optical axis or perpendicular to the direction of the optical axis. The camera has the advantages that the single magnet driving structure is simple and is not easily interfered by an external magnetic field, the precise control and stability of the aperture are improved, only one magnet is needed, the size of the driving part is smaller, the light and miniaturization of the camera design is facilitated, only the single magnet is needed to drive the aperture, the structure is simpler, parts and assembly processes are reduced, and the cost is reduced. In the aspect of diaphragm anti-shake, a lighter and thinner design is used, so that the memory alloy wire and the conductive layout occupy less space in the optical axis direction.

Description

Technical Field

[0001] The present application belongs to the field of electronic equipment camera, and in particular, relates to an aperture driving mechanism, a lens driving device and a camera module. Background Art

[0002] The aperture drive mechanism refers to a mechanical device used to control the aperture size of a camera lens. In a camera lens, the aperture is an adjustable aperture consisting of multiple thin sheets or blades, which is used to control the amount of light entering the camera, thereby adjusting the depth of field and the brightness of the light.

[0003] The micro camera used in mobile phones is generally equipped with a variable aperture on the lens, which is placed at the front end of the lens. Therefore, it will increase the total height and weight of the lens, causing adverse effects on the focus drive mechanism.

[0004] In patent CN217484662U, the imaging lens has an optical axis, and the imaging lens includes a lens carrier and a variable through hole group. The lens carrier is used to set at least one lens, and the lens carrier includes a mounting structure. The variable through hole group includes a plurality of movable blades and a rotating element. The movable blades can be movably arranged together around the optical axis to form a through hole, and the through hole has a variable size through the movement of the movable blades. The rotating element connects the movable blades, and the rotating element drives the movable blades to adjust the size of the through hole. At least one of the movable blades of the variable through hole group and the rotating element is arranged on the mounting structure. The utility model also discloses a camera module having the above-mentioned imaging lens and an electronic device having the camera module.

[0005] Patent CN102545527B discloses a voice coil motor, which includes a fixed body having a first receiving cavity, a movable barrel movably received in the first receiving cavity, at least two upper rolling members and at least two lower rolling members. The fixed body includes at least one upper groove and at least one lower groove. The at least two upper rolling members and the at least two lower rolling members are respectively arranged in the at least one upper groove and the at least one lower groove and are pressed against the movable barrel, so that friction can be generated between the at least two upper rolling members and the at least two lower rolling members and the movable barrel. The utility model also relates to a camera module having the voice coil motor and a portable electronic device having the camera module.

[0006] In the above patents and prior art, the driving mechanism of the aperture drive mechanism is mostly a symmetrical dual-magnet drive. The disadvantage of this design is that the dual-magnet drive requires two magnets to drive the opening and closing of the aperture, which results in a large size of the driving component, which is not conducive to the design of a lightweight and miniaturized camera. At the same time, it is easily affected by external magnetic fields, affecting the precise control and stability of the aperture, which may lead to unstable or unsatisfactory shooting effects, and the structure is relatively complex. Utility Model Content

[0007] The purpose of the utility model is to provide an aperture driving mechanism, a lens driving device and a camera module that can solve the above technical problems.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] The aperture driving mechanism comprises an aperture support and a plurality of aperture blades which move relative to the aperture support in a plane perpendicular to the optical axis, wherein the plurality of aperture blades surround a light inlet hole, and an aperture driving frame which drives the aperture blades to move so as to change the aperture of the light inlet hole is provided on the aperture support, and a driving magnet or a driving coil is provided on the aperture driving frame, wherein the driving magnet and the driving coil are relatively distributed with intervals along the optical axis direction or perpendicular to the optical axis direction.

[0010] Furthermore, the aperture driving frame is located inside the aperture bracket and is rotatably connected to the aperture bracket around the optical axis.

[0011] Furthermore, at least a portion of the aperture blades is rotatably connected to the aperture driving frame, and at least another portion is slidably connected to the aperture bracket on the plane.

[0012] The present application also provides a lens driving device, which includes a lens driving mechanism and an aperture driving mechanism arranged on the incident light side of the lens driving mechanism, the lens driving mechanism includes a base, the base is connected to a lens carrier, the lens driving mechanism also includes a focus driving component that drives the lens carrier to move axially along the optical axis, the focus driving component includes at least one group of relatively arranged focus magnets and focus coils, one of the focus magnets and the focus coils is arranged on the lens carrier, and the other is arranged on the base; under the projection in the direction of the optical axis, the drive magnet and the drive coil have no overlapping parts with the focus magnet.

[0013] Furthermore, the lens driving mechanism also includes a guide assembly, which includes two guide pillars fixed on the base, and guide holes are provided on the lens carrier for the guide pillars to be inserted one by one and slidably connected to the guide pillars, and the two guide pillars are respectively located at a pair of corners of the lens carrier.

[0014] Furthermore, the lens carrier is provided with a magnetic magnet, and the magnetic magnet is attracted to the guide post and makes the guide post close to at least a part of the inner wall of the guide hole.

[0015] Furthermore, the magnetic magnets correspond to the guide pillars one by one, and the two magnetic magnets are respectively located on both sides of the line connecting the centers of the two guide pillars.

[0016] Furthermore, the aperture driving mechanism further comprises a circuit board electrically connected to the driving coil, a conducting member is provided between the lens carrier and the base, and at least a portion of the circuit board is electrically connected to the conducting member.

[0017] Furthermore, the lens driving mechanism also includes a sensor anti-shake component, which is fixed to a side of the lens driving mechanism away from the aperture driving mechanism, and the sensor anti-shake component includes a conductive base plate, a movable plate is provided on the conductive base plate, and an SMA wire is provided between the conductive base plate and the movable plate to drive the movable plate to perform anti-shake movement on the conductive base plate.

[0018] The present application also provides a camera module, which includes the lens driving device.

[0019] Compared with the existing technology, the advantages of the present application are: the single magnet drive structure is simple and not easily affected by external magnetic field interference, which improves the precise control and stability of the aperture. At the same time, only one magnet is required, and the driving components are smaller in size, which is conducive to the lightweight and miniaturized design of the camera. Only one magnet is needed to drive the opening and closing of the aperture, and the structure is simpler, reducing the number of parts and assembly processes. In terms of aperture anti-shake, the present application uses a lighter and thinner plate design, so that the memory alloy wire and the conductive layout occupy less space in the direction of the optical axis. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the main structure assembly diagram of the aperture drive mechanism of the utility model;

[0021] Figure 2 for Figure 1 Exploded view of the main structure assembly of the middle aperture drive mechanism A;

[0022] Figure 3 for Figure 1 Exploded view of the main structure assembly of the middle aperture drive mechanism B;

[0023] Figure 4 This is a top view of the main structure of the aperture drive mechanism of the utility model;

[0024] Figure 5 for Figure 4 Sectional structure diagram along line AA;

[0025] Figure 6 This is the assembly diagram of the aperture bracket unit in the aperture drive mechanism;

[0026] Figure 7 This is a diagram showing the installation relationship between the aperture drive frame and the drive magnet in the aperture drive mechanism;

[0027] Figure 8 This is an assembly diagram of the main structure of the lens driving device of the utility model;

[0028] Fig. 9 for Figure 8 A top view of the main structure of the middle lens driving device;

[0029] Fig.10 for Fig. 9 Sectional structure diagram along the middle BB;

[0030] Fig.11 for Figure 8 Exploded view of the main structure of the middle lens driving device;

[0031] Fig.12 This is the main structure assembly diagram of the sensor anti-shake component of the utility model;

[0032] Fig.13 for Fig.12 An exploded diagram of the main structure of the sensor anti-shake component;

[0033] Fig.14 It is the assembly diagram of the aperture drive mechanism and the lens drive device;

[0034] Fig.15 This is a schematic diagram of an electronic device in Embodiment 3.

[0035] In the figure, the aperture bracket 1, the circuit board 10, the detection chip 11, the through hole 12, the front shell 13, the rear shell 14, the aperture blades 2, the aperture drive frame 3, the drive magnet 30, the magnet positioning groove 300, the drive coil 31, the base 4, the shell 40, the spring 41, the guide assembly 5, the guide column 50, the magnetic magnet 500, the guide hole 51, the lens carrier 6, the focus drive assembly 7, the focus magnet 70, the focus coil 71, the sensor anti-shake assembly 8, the conductive bottom plate 80, the rotating plate 81, the SMA wire 82, the optical axis Z, and the plane xY. DETAILED DESCRIPTION

[0036] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0037] Embodiment 1

[0038] The aperture driving mechanism comprises an aperture support 1, and a plurality of aperture blades 2 moving relative to the aperture support 1 in a plane perpendicular to the optical axis Z, wherein the plurality of aperture blades 2 surround a light inlet hole, an aperture driving frame 3 driving the aperture blades 2 to move so as to change the aperture of the light inlet hole is provided on the aperture support 1, and a driving magnet 30 or a driving coil 31 is provided on the aperture driving frame 3, and the driving magnet 30 and the driving coil 31 are relatively distributed with intervals along the optical axis Z direction or perpendicular to the optical axis Z direction.

[0039] The advantage of having a unilateral driving magnet 30 or a driving coil 31 on the aperture driving frame 3 is that the unilateral driving structure is simple and not easily disturbed by the external magnetic field, thereby improving the precise control and stability of the aperture. At the same time, only one magnet is required, and the driving component is smaller in size, which is conducive to the lightweight and miniaturized design of the camera. Only one magnet is needed to drive the opening and closing of the aperture, so the structure is simpler and the number of parts and assembly processes is reduced.

[0040] The aperture driving frame 3 is located inside the aperture bracket 1 and is rotatably connected to the aperture bracket 1 around the optical axis Z.

[0041] The aperture bracket 1 has a space inside. The aperture bracket 1 includes a front housing 13 and a rear housing 14 . The aperture driving frame 3 is built in the space, and the aperture driving frame 3 and the aperture bracket 1 are rotatably connected.

[0042] The advantage of this design is that arranging the aperture drive frame 3 on the inner side of the aperture bracket 1 can make the overall structure more compact, save space, reduce the size and weight of the device, and at the same time reduce the interference of external factors on the aperture.

[0043] The rotation connection adopts the method of ball group, specifically: a plurality of ball groups are arranged between the front housing 13 and the aperture drive frame 3, and the plurality of ball groups are evenly distributed in the circumferential direction around the optical axis Z. The ball group includes balls and ball grooves, and the front housing 13 and the aperture drive frame 3 are both provided with ball grooves for accommodating balls on the opposite sides, and the ball grooves are arranged along the circumferential direction of the aperture drive frame 3, and a magnetic attraction member that attracts the driving magnet 30 on the aperture drive frame 3 is embedded in the front housing 13.

[0044] The aperture blade 2 is partially connected to the aperture drive frame 3 through a pin shaft, so that when driven, the aperture blade 2 can rotate relative to the aperture drive frame 3. The aperture blade 2 is also provided with a waist-shaped hole, and the aperture bracket 1 is provided with a fixed shaft that cooperates with the waist-shaped hole, so that the aperture blade 2 and the aperture bracket 1 can be relatively slidably connected.

[0045] In other embodiments, at least a portion of the aperture blades 2 is slidably connected to the aperture driving frame 3 on the plane xY, and at least another portion is rotatably connected to the aperture bracket 1 .

[0046] The aperture blade 2 is connected to the aperture drive frame 3 through a fixed shaft, so that when driven, the aperture blade 2 can rotate relative to the aperture drive frame 3. There are waist-shaped holes and fixed shafts between the aperture blade 2 and the aperture bracket 1, so that the aperture blade 2 and the aperture bracket 1 can be relatively slidably connected.

[0047] A magnet positioning groove 300 is provided in the circumferential direction of the aperture driving frame 3 , and the driving magnet 30 is fixed in the magnet positioning groove 300 .

[0048] After the driving magnet 30 is fixed in the magnet positioning groove 300 , the circumferential force on the aperture driving frame 3 is uniform, and the rotation of the aperture driving frame 3 is not hindered due to uneven force.

[0049] The driving coil 31 is fixed on the circuit board 10 .

[0050] The circuit board 10 is fixed on the lens driving mechanism and supplies power to the driving coil 31. The circuit board 10 is circumferentially arranged in the gap between the aperture driving frame 3 and the aperture bracket 1, and will not affect the space of the aperture driving mechanism.

[0051] A detection chip 11 is disposed on the circuit board 10 and is spaced apart from the driving magnet 30 .

[0052] In this embodiment, the detection chip 11 is disposed in the middle of the driving coil 31. When driving, the detection chip 11 is perpendicular to the magnetic field lines of the driving magnet 30, and the detection of magnetic field changes is most sensitive.

[0053] A through hole 12 for accommodating the drive coil 31 is provided on the aperture holder 1 .

[0054] The through hole 12 is disposed between the driving coil 31 and the driving magnet 30 , so that there is no barrier between the driving coil 31 and the driving magnet 30 , thereby reducing the weakening of the magnetic field of the driving magnet 30 and improving the driving efficiency.

[0055] Embodiment 2

[0056] The structure and principle of this embodiment are basically the same as those of the first embodiment, and the difference lies in that, with respect to the aperture driving mechanism of the first embodiment, the lens driving device of this embodiment includes a lens driving mechanism and an aperture driving mechanism arranged on the incident light side of the lens driving mechanism.

[0057] The lens driving mechanism includes a base 4, to which a lens carrier 6 is connected. The lens driving mechanism also includes a focus driving assembly 7 for driving the lens carrier 6 to move axially along the optical axis Z. The focus driving assembly 7 includes at least one group of relatively arranged focus magnets 70 and focus coils 71. One of the focus magnets 70 and the focus coils 71 is arranged on the lens carrier 6, and the other is arranged on the base 4. Under the projection in the direction of the optical axis Z, the drive magnet 30 and the drive coil 31 have no overlapping parts with the focus magnet 70.

[0058] The advantage of the layout design of the driving magnet 30 and the driving coil 31 is that avoiding the overlapping parts of the driving magnet 30 and the driving coil 31 with the focusing magnet 70 in the Z direction of the optical axis can reduce the mutual interference between them, reduce the errors caused by the mutual interference of the magnetic fields, improve the accuracy and stability of the focusing system, and ensure the normal operation and stability of each component.

[0059] In this embodiment, two groups of focus magnets 70 are provided and are symmetrically distributed with respect to the optical axis Z. The focus magnets 70 are fixed on the base 4. The focus coils 71 correspond to the focus magnets 70. The focus coils 71 surround the two opposite side walls of the lens carrier 6 in a direction perpendicular to the optical axis Z. The driving magnets 30 in the aperture driving mechanism are adjacent to the two groups of focus magnets 70. The focus magnets 70 extend in a first direction perpendicular to the optical axis Z, and the driving magnets 40 extend in a second direction perpendicular to the optical axis Z and the first direction.

[0060] A spring sheet 41 is arranged between the lens carrier 6 and the base 4. In this embodiment, there are two groups of spring sheets 41. The spring sheets 41 have the function of supporting the lens carrier 6, and also have the effects of rebounding and restoring and conducting electricity.

[0061] The aperture drive mechanism further includes a circuit board 10 electrically connected to the drive coil 31. A conductive member is provided between the lens carrier 6 and the base 4. At least part of the circuit board 10 is electrically connected to the conductive member. A group of springs 41 is electrically connected to the circuit board 10 as part of the conductive member. One end of the spring 41 away from the circuit board 10 is connected to the base 4. The base 4 is provided with a connection terminal electrically connected to the spring 41. The connection terminal can be fixed on the base 4 or embedded in the base 4.

[0062] Each group of spring pieces 41 has two spring pieces, one of which is used to supply power to the focusing coil 71 , and the other spring piece is used to supply power to the circuit board 10 .

[0063] The lens driving mechanism also includes a guide assembly 5, which includes two guide pillars 50 fixed on the base 4. A guide hole 51 is provided on the lens carrier 6 for the guide pillars 50 to be inserted one by one and is slidably connected to the guide pillars 50. The two guide pillars 50 are respectively located at a pair of corners of the lens carrier 6.

[0064] The two guide posts 50 are distributed on one of the diagonal lines of the base 4. Distributing the guide posts 50 on one of the diagonal lines of the base 4 can improve the stability of the mechanism and reduce shaking and tilting during use.

[0065] The lens carrier 60 is provided with a magnetic magnet 500 , which attracts the guide post 50 and makes the guide post 50 close to at least a part of the inner wall of the guide hole 51 .

[0066] The magnetic magnet 500 is used to improve the stability of the lens carrier 60 when it moves in the optical axis Z direction, and to prevent the imaging from being blurred due to vibration caused by the tiny gap between the guide pillar 50 and the guide hole 51.

[0067] The magnetic magnets 500 correspond to the guide pillars 50 one by one, and the two magnetic magnets 500 are respectively located on both sides of the line connecting the centers of the two guide pillars 50 .

[0068] Placing the two magnetic magnets 500 on both sides of the center line of the guide pillars 50 can maintain the balance of the system and avoid instability caused by uneven weight distribution.

[0069] In this embodiment, the lens carrier 6 is provided with a placement groove for placing the magnetic magnet 50 , the placement groove is connected to the corresponding guide hole 51 , and the guide hole 51 has at least two side wall surfaces arranged at an angle to abut against the guide column 50 .

[0070] The lens driving mechanism also includes a sensor anti-shake assembly 8, which is fixed to a side of the lens driving mechanism away from the aperture driving mechanism, and the sensor anti-shake assembly 8 includes a conductive base plate 80, on which a movable plate 81 is provided, and between the conductive base plate 80 and the movable plate 81, an SMA wire 82 is provided for driving the movable plate 81 to perform anti-shake movement on the conductive base plate 80.

[0071] In this embodiment, the conductive and anti-shake devices are designed to be plate-shaped, and the thickness in the direction of the optical axis Z is small, so that the conductive bottom plate 80 and the rotating plate 81 occupy less space in the direction of the optical axis Z. The anti-shake motion includes translation on the plane xY and rotation around the optical axis Z.

[0072] Embodiment 3

[0073] The structure and principle of this embodiment are basically the same as those of the second embodiment, and the different structure is that, with respect to the lens driving device of the second embodiment, the camera module of this embodiment includes a lens driving device.

[0074] The camera module is used in electronic devices, including 3C products, such as computers, mobile smart phones and digital cameras. In this embodiment, the module is used as a camera imaging component of a mobile smart phone.

[0075] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An aperture drive mechanism, comprising an aperture support (1), and a plurality of aperture blades (2) moving relative to the aperture support (1) in a plane perpendicular to an optical axis (Z), wherein the plurality of aperture blades (2) surround a light inlet hole, and an aperture drive frame (3) is provided on the aperture support (1) for driving the aperture blades (2) to move so as to change the aperture of the light inlet hole, characterized in that: A driving magnet (30) or a driving coil (31) is provided on the aperture driving frame (3), and the driving magnet (30) and the driving coil (31) are relatively distributed with intervals along the direction of the optical axis (Z) or perpendicular to the direction of the optical axis (Z).

2. The aperture drive mechanism according to claim 1, characterized in that: The aperture driving frame (3) is located inside the aperture support (1) and is rotatably connected to the aperture support (1) around an optical axis (Z).

3. The aperture drive mechanism according to claim 1 or 2, characterized in that: At least part of the aperture blades (2) is rotatably connected to the aperture drive frame (3), and at least another part is slidably connected to the aperture support (1) on the plane (xY).

4. A lens driving device, characterized in that: The lens driving device comprises a lens driving mechanism and an aperture driving mechanism according to any one of claims 1 to 3 arranged on the incident light side of the lens driving mechanism, the lens driving mechanism comprises a base (4), the base (4) is connected to a lens carrier (6), the lens driving mechanism further comprises a focus driving assembly (7) for driving the lens carrier (6) to move axially along the optical axis (Z), the focus driving assembly (7) comprises at least one group of relatively arranged focus magnets (70) and focus coils (71), one of the focus magnets (70) and the focus coils (71) is arranged on the lens carrier (6), and the other is arranged on the base (4); under the projection in the direction of the optical axis (Z), neither the drive magnet (30) nor the drive coil (31) has any overlapping part with the focus magnet (70).

5. The lens driving device according to claim 4, characterized in that: The lens driving mechanism further comprises a guide assembly (5), wherein the guide assembly (5) comprises two guide posts (50) fixed on the base (4), and guide holes (51) are provided on the lens carrier (6) for inserting the guide posts (50) one by one and slidably connected to the guide posts (50), and the two guide posts (50) are respectively located at a pair of corners of the lens carrier (6).

6. The lens driving device according to claim 4, characterized in that: The lens carrier (6) is provided with a magnetic magnet (500), and the magnetic magnet (500) attracts the guide column (50) and makes the guide column (50) close to at least a part of the inner wall of the guide hole (51).

7. The lens driving device according to claim 6, characterized in that: The magnetic magnets (500) correspond to the guide pillars (50) one by one, and the two magnetic magnets (500) are respectively located on both sides of a line connecting the centers of the two guide pillars (50).

8. The lens driving device according to claim 4, characterized in that: The aperture drive mechanism further comprises a circuit board (10) electrically connected to the drive coil (31); a conductive member is provided between the lens carrier (6) and the base (4); and at least a portion of the circuit board (10) is electrically connected to the conductive member.

9. The lens driving device according to claim 4, characterized in that: The lens driving mechanism further comprises a sensor anti-shake component (8), wherein the sensor anti-shake component (8) is fixed to a side of the lens driving mechanism away from the aperture driving mechanism, and the sensor anti-shake component (8) comprises a conductive base plate (80), a movable plate (81) is arranged on the conductive base plate (80), and an SMA wire (82) is arranged between the conductive base plate (80) and the movable plate (81) for driving the movable plate (81) to perform anti-shake movement on the conductive base plate (80).

10. A camera module, characterized in that: The camera module includes the lens driving device described in any one of claims 4-9.

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